God comments his code, you should too

This summer me and a few friends are working on a project that involves making a parallel implementation of evolutionary tree construction algorithms, using MPI. Our first step during the process was to take an implementation of some of these algorithms, freely distributed of course, and make them run in parallel. The code we began to work off of was terrible, it was devoid of comments and was very difficult to follow.

(There is a point ahead I promise...)

During one of our meetings we were discussing DNA sequencing, and the topic came up that much of DNA code is supposedly unused. "Comments." one of my friends suggested. So anyway the point I'm getting to is if "God" can take the time out to "write" useless pieces of code in the DNA sequence, that serve no known purpose, why can't programmers take the time to write comments in their code? If not for themselves in the future, at least for those who will be using the code after them. On a side note we did manage to get our parallel implementation running, but it was a pain w/o having some knowledge as to what the original programmers were doing.